Answer to Question #51842 in Optics for Samuel

Question

4 Which of the following is correct about tracing ray digrams with curved mirrors? a) rays incident at the centre of the mirror are reflected through the centre of curvature b) rays passing through the centre of curvature are reflected through the pricipal focus c) rays passing through the pricipal focus are reflected on themselves d) rays parallel and close to the principal axis are reflected through the pricipal focus
5 The null condition in potentiometer experiment shows that? a)the potential difference under test is zero b) current is varying in the circuit c) current is increasing in the circuit d) potential differences are balanced
9 The potentiometer wire plays equivalent role of which of these devices in a circuit? a) rheostat b)thermostat c) galvanometer d) ammeter